- The refractive error, based on manifest refraction (adjusted for optical infinity), must be MRSE up to -15.00 D with manifest cylinder between 0.00 and -6.00 D; MRSE up to +9.00 D with cylinder between 0.00 and +6.00 D; or manifest cylinder (from 1.00 to 6.00 D) greater than the magnitude of sphere, and the cylinder and sphere have opposite signs.